crashpad/util/file/delimited_file_reader.h
Mark Mentovai 6278690abe Update copyright boilerplate, 2022 edition (Crashpad)
sed -i '' -E -e 's/Copyright (.+) The Crashpad Authors\. All rights reserved\.$/Copyright \1 The Crashpad Authors/' $(git grep -El 'Copyright (.+) The Crashpad Authors\. All rights reserved\.$')

Bug: chromium:1098010
Change-Id: I8d6138469ddbe3d281a5d83f64cf918ec2491611
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3878262
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
2022-09-06 23:54:07 +00:00

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// Copyright 2017 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
#define CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_
#include <stdint.h>
#include <string>
#include "util/file/file_reader.h"
namespace crashpad {
//! \brief Reads a file one field or line at a time.
//!
//! The file is interpreted as a series of fields separated by delimiter
//! characters. When the delimiter character is the newline character
//! (<code>'\\n'</code>), the file is interpreted as a series of lines.
//!
//! It is safe to mix GetDelim() and GetLine() calls, if appropriate for the
//! format being interpreted.
//!
//! This is a replacement for the standard librarys `getdelim()` and
//! `getline()` functions, adapted to work with FileReaderInterface objects
//! instead of `FILE*` streams.
class DelimitedFileReader {
public:
//! \brief The result of a GetDelim() or GetLine() call.
enum class Result {
//! \brief An error occurred, and a message was logged.
kError = -1,
//! \brief A field or line was read from the file.
kSuccess,
//! \brief The end of the file was encountered.
kEndOfFile,
};
explicit DelimitedFileReader(FileReaderInterface* file_reader);
DelimitedFileReader(const DelimitedFileReader&) = delete;
DelimitedFileReader& operator=(const DelimitedFileReader&) = delete;
~DelimitedFileReader();
//! \brief Reads a single field from the file.
//!
//! \param[in] delimiter The delimiter character that terminates the field.
//! It is safe to call this method multiple times while changing the value
//! of this parameter, if appropriate for the format being interpreted.
//! \param[out] field The field read from the file. This parameter will
//! include the fields terminating delimiter character unless the field
//! was at the end of the file and was read without such a character.
//! This parameter will not be empty.
//!
//! \return a #Result value. \a field is only valid when Result::kSuccess is
//! returned.
Result GetDelim(char delimiter, std::string* field);
//! \brief Reads a single line from the file.
//!
//! \param[out] line The line read from the file. This parameter will include
//! the line terminating delimiter character unless the line was at the
//! end of the file and was read without such a character. This parameter
//! will not be empty.
//!
//! \return a #Result value. \a line is only valid when Result::kSuccess is
//! returned.
Result GetLine(std::string* line);
private:
char buf_[4096];
FileReaderInterface* file_reader_; // weak
uint16_t buf_pos_; // Index into buf_ of the start of the next field.
uint16_t buf_len_; // The size of buf_ thats been filled.
bool eof_; // Caches the EOF signal when detected following a partial field.
};
} // namespace crashpad
#endif // CRASHPAD_UTIL_FILE_DELIMITED_FILE_READER_H_